Positron accumulation in the GBAR experiment

We present a description of the GBAR positron (e+) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (H...

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Published in:arXiv.org 2022-05
Main Authors: Blumer, P, Charlton, M, Chung, M, Clade, P, Comini, P, Crivelli, P, Dalkarov, O, Debu, P, Dodd, L, Douillet, A, Guellati, S, P -A Hervieux, Hilico, L, Indelicato, P, Janka, G, Jonsell, S, J -P Karr, Kim, B H, Kim, E S, Kim, S K, Y Ko, Kosinski, T, Kuroda, N, Latacz, B M, Lee, B, Lee, H, Lee, J, Leitee, A M M, Leveque, K, Lim, E, Liszkay, L, Lotrus, P, Lunney, D, Manfredi, G, Mansoulie, B, Matusiak, M, Mornacchi, G, Nesvizhevsky, V, Nez, F, Niang, S, Nishi, R, Ohayon, B, Park, K, Paul, N, Perez, P, Procureur, S, Radics, B, Regenfus, C, J -M Reymond, Reynaud, S, J -Y Rousse, Rousselle, O, Rubbia, A, Rzadkiewicl, J, Sacquin, Y, Schmidt-Kaler, F, Staszczak, M, Szymczyk, K, Tanaka, T, Tuchming, B, Vallage, B, Voronin, A, D P van der Werf, Wolf, S, Won, D, Wronka, S, Yamazaki, Y, Yoo, K H, Yzombard, P, collaboration, GBAR, Baker, C J
Format: Article
Language:English
Subjects:
Antihydrogen
Antiparticles
Antiprotons
Free fall
Gravitational fields
High vacuum
Low temperature
Positronium
Positrons
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Summary:We present a description of the GBAR positron (e+) trapping apparatus, which consists of a three stage Buffer Gas Trap (BGT) followed by a High Field Penning Trap (HFT), and discuss its performance. The overall goal of the GBAR experiment is to measure the acceleration of the neutral antihydrogen (H) atom in the terrestrial gravitational field by neutralising a positive antihydrogen ion (H+), which has been cooled to a low temperature, and observing the subsequent H annihilation following free fall. To produce one H+ ion, about 10^10 positrons, efficiently converted into positronium (Ps), together with about 10^7 antiprotons (p), are required. The positrons, produced from an electron linac-based system, are accumulated first in the BGT whereafter they are stacked in the ultra-high vacuum HFT, where we have been able to trap 1.4(2) x 10^9 positrons in 1100 seconds.
ISSN:2331-8422
DOI:10.48550/arxiv.2205.04530